| 摘要 |
PROBLEM TO BE SOLVED: To adequately minimize variation in the charging condition among cells while avoiding wasteful loss of electric energy charged in a battery pack as much as possible. SOLUTION: A voltage equalizer is equipped with a discharging circuit DC in parallel to each of cells 1a in the battery pack 1 constituted by connecting the cells 1a in series. The cell 1a in a maximal voltage level is discharged to the discharging circuit when a voltage difference reachesΔVst in between the cell 1a in the maximal voltage level and that in a minimal voltage level. The voltage equalizer stops discharging when the voltage difference goesΔVen (ΔVen<ΔVst) or less in between the voltage in the discharging cell 1a and that in the minimal voltage level, and the discharging cell 1a comes close to its full charge. Also, the equalizer stops discharging when the voltage in the discharging cell 1a goes below a discharge-stopping level determined as equivalent to the voltage in any cells 1a other than the discharging cell 1a. COPYRIGHT: (C)2011,JPO&INPIT |
